Chap. IY. 



LYTHKUM SALIOAEIA. 

 Fig. 10. 



139 



Diagram of the flowers of the three forms of Lythrum salicaria, in their natural 

 position, with the petals and calyx removed on the near side : enlarged sir times. 



The dotted lines with the arrows show the directions in which pollen must be 

 carried to each stigma to ensure full fertility. 



